Question about 1997 Dodge Ram 1500 Club Cab

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2002 Dodge Ram idle hunts

I just bought a used Ram about a month ago and we had to drop a new engine in it because it stalled everytime i hit the gas and then let off and two cylinders werent hitting. It has the 5.9L V8. However, even after we put the new engine in im experiencing the same stalling problems. If i rev it to 3000 RPMS or so and then let off quickly, it will just stall out like the key was taken out. Since we had the throttle body from the old engine on the newer one we picked up, we switched it out so that the new throttle body was on as well. I thought that this would solve the problem, and it did for 2 weeks. However yesterday the problem returned and it still stalls out when attempting to idle or deccelerating. Im not sure that it is the TPS, since that would mean that both TPS' were bad on both throttle bodies and that seems unlikely. I cant afford to take it into a shop, so somebody please tell me what the problem could be similar problem. 2002 ram 1500, 85k miles. Start it up and the idle hunts. 2000 rpms initally, eventually drop to 700 or so. Even when it is warm, same characteristics. Cleaned thottle body, cleaned IAC and verified it moved when energized. Will check TPS, after that, where do I go, computer issues? thanks

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  • Colin Stickland
    Colin Stickland May 11, 2010

    sorry to bring bad news so dont shoot the messenger but i think it will need the computer re setting,sounds like the old engine was fine ??did you do a compression check??before you pulled it out.Also the choke temperature sensor ??but if old engine was the same and it now has another with a different sensor?? to be honest without the beast in front of me its difficult to advise,Anyway best of british with it mate

  • Richard Scordino May 11, 2010

    Just an observation...If you transferred all sensors from the old engine to the new one, then the problem was likely to follow to the new one. If not, then the one "constant" is the computer itself and the attending wiring harnesses. Therefore, that is where I would begin looking for the malfunction.

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Sounds like a bad IAC motor or passages. This is usaully the cause of idle hunting. Could also have a vacuum leak in the bottom of the manifold. Look through throttle body with flash light. If you see oil on the bottom of the intake, the gasket is blown on the bottom of the intake.

Posted on Jun 02, 2009

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There is a sensor/motor on the back of the throttel body it is called Idle Air Control Motor or Idle Air Control sensor it is about 50.00 and you can get it from the auto parts store and that is the part that makes it die after you touch the gas i got my dodge from the dealer with this probler for cheap i fixed it on the lot in about 5 min and drove it home

Posted on Jun 03, 2009

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